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Tektronix 7B15
1 GHz delaying timebase

Compatible with 7000-series scopes

Produced from 1978 to 1990

(All manuals in PDF format unless noted otherwise)
Manuals – Specifications – Links – Pictures

The Tektronix 7B15 is a 1 GHz delaying time base for 7000-series scopes, in particular, the 1 GHz 7104 (typically used with 7A29 vertical amplifiers and a 7B10 delayed time base).

The 7B15 provides digital readout of delay and delta times. In effect, the 7B15/7B10 pair are speed-improved versions of the 7B85/7B80.

Key Specifications

Sweep 200 ms/Div to 2 ns/Div in 1−2−5 sequence, ×10 magnifier down to 200 ps/Div, variable to ×2.5
Triggering to 1 GHz
Jitter less than 30 ps at 1 GHz
  • Digital read-out of delay and delta times
  • Variable Trigger Holdoff
  • HF Sync mode


A ramp generator is started when the trigger signal arrives. The delayed sweep is started when a comparator detects that the ramp has reached a control voltage, set by the front panel knobs. The control voltage is therefore proportional to the amount of delay and is measured using a 155-0185-00 4-digit DVM circuit, then displayed on the oscilloscope readout. The display, scaled in seconds, provides the operator with a precise readout of the delay.

Other custom Tek ICs used: 155-0150-00 trigger detector, 155-0160-00 trigger amplifier.

The 7B15 uses the +50 V supply provided by the mainframe.


Year 1980 1985 1990
Catalog price $1,695 $2,695 $3,300
In 2022 Dollars $5,900 $7,200 $7,300


Custom ICs used in the 7B15

Page Model Part nos Description Designers Used in
155-0049-00 M079G 155-0049-00 155-0049-01 155-0049-02 sweep control with lockout Bill DeVey 335 464 465 466 475 475A 475M 485 5B31 5B40 5B52 5B42 5B44 7B53A 7B80 7B85 7B87 7B92A 7B90P 7B10 7B15 SC502 7B42N AN/USM-281C 067-0657-00
155-0149-00 155-0149-00 155-0149-00 sweep control 7B10 7B15
155-0150-00 H473 155-0150-00 trigger detector Art Metz 7904A 7104 7B10 7B15 7B92A SCD1000
155-0160-00 M136 155-0160-00 1.5 GHz trigger amplifier and source select Art Metz 7B10 7B15 067-0587-02 067-0587-10
155-0185-00 M187 155-0185-00 4-digit digital voltmeter Don Larson 7B15 7B85 7B87